xref: /freebsd-10.3-release/usr.sbin/bsdconfig/share/media/http.subr

if [ ! "$_MEDIA_HTTP_SUBR" ]; then _MEDIA_HTTP_SUBR=1
#
# Copyright (c) 2012-2013 Devin Teske
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $FreeBSD: head/usr.sbin/bsdconfig/share/media/http.subr 252987 2013-07-07 18:51:44Z dteske $
#
############################################################ INCLUDES

BSDCFG_SHARE="/usr/share/bsdconfig"
. $BSDCFG_SHARE/common.subr || exit 1
f_dprintf "%s: loading includes..." media/http.subr
f_include $BSDCFG_SHARE/device.subr
f_include $BSDCFG_SHARE/dialog.subr
f_include $BSDCFG_SHARE/media/common.subr
f_include $BSDCFG_SHARE/media/tcpip.subr
f_include $BSDCFG_SHARE/strings.subr
f_include $BSDCFG_SHARE/struct.subr
f_include $BSDCFG_SHARE/variable.subr

BSDCFG_LIBE="/usr/libexec/bsdconfig"
f_include_lang $BSDCFG_LIBE/include/messages.subr

############################################################ GLOBALS

HTTP_SKIP_RESOLV=

URL_MAX=261261
	# NOTE: This is according to actual fetch(1) test-results. We actually
	# use nc(1) to retrieve files, but it's still a good idea to keep the
	# URLs short enough that fetch(1) won't complain.

HTTP_DIRS="
	.
	releases/$UNAME_P
	snapshots/$UNAME_P
	pub/FreeBSD
	pub/FreeBSD/releases/$UNAME_P
	pub/FreeBSD/snapshots/$UNAME_P
	pub/FreeBSD-Archive/old-releases/$UNAME_P
" # END-QUOTE

############################################################ FUNCTIONS

# f_dialog_menu_media_http
#
# Prompt the user to select from a range of ``built-in'' HTTP servers or
# specify their own. If the user makes a choice and doesn't cancel or press
# Esc, stores the user's choice in VAR_FTP_PATH (see variable.subr) and returns
# success.
#
f_dialog_menu_media_http()
{
	f_dialog_title "$msg_please_select_a_freebsd_http_distribution_site"
	local title="$DIALOG_TITLE" btitle="$DIALOG_BACKTITLE"
	f_dialog_title_restore
	local prompt="$msg_please_select_the_site_closest_to_you_or_other"
	local menu_list="
		'URL' '$msg_specify_some_other_http_site'
	" # END-QUOTE
	local hline="$msg_select_a_site_thats_close"

	local height width rows
	eval f_dialog_menu_size height width rows \
	                        \"\$title\"  \
	                        \"\$btitle\" \
	                        \"\$prompt\" \
	                        \"\$hline\"  \
	                        $menu_list

	local mtag
	mtag=$( eval $DIALOG \
		--title \"\$title\"             \
		--backtitle \"\$btitle\"        \
		--hline \"\$hline\"             \
		--ok-label \"\$msg_ok\"         \
		--cancel-label \"\$msg_cancel\" \
		--menu \"\$prompt\"             \
		$height $width $rows            \
		$menu_list                      \
		2>&1 >&$DIALOG_TERMINAL_PASSTHRU_FD
	) || return $FAILURE
	f_dialog_data_sanitize mtag

	case "$mtag" in
	URL) setvar $VAR_HTTP_PATH "other" ;;
	*)
		local value
		value=$( eval f_dialog_menutag2item \"\$mtag\" $menu_list )
		setvar $VAR_HTTP_PATH "http://$value"
	esac
	
	return $SUCCESS
}

# f_media_set_http
#
# Return success if we both found and set the media type to be an HTTP server.
#
# Variables from variable.subr that can be used to script user input:
#
# 	VAR_HTTP_PATH
# 		URL containing host and optionally a target path to the release
# 		repository on the HTTP server. Valid examples include:
# 			http://myhost
# 			http://somename:80/pub/
# 			http://192.168.2.3/pub/
# 			http://[::1]:8000/
# 		The default port if not specified is 80.
# 	VAR_NAMESERVER [Optional]
# 		If set, overrides resolv.conf(5) and sets the nameserver that
# 		is used to convert names into addresses (when a name converts
# 		into multiple addresses, the first address to successfully
# 		connect is used).
#
# Meanwhile, the following variables from variable.subr are set after
# successful execution:
#
# 	VAR_HTTP_HOST
# 		The HTTP host to connect to, parsed from VAR_HTTP_PATH. In the
# 		example case of IPv6 where VAR_HTTP_PATH is "http://[::1]" this
# 		variable will be set to "::1" (the outer brackets are removed).
# 	VAR_HTTP_PORT
# 		The TCP port to connect to, parsed from VAR_HTTP_PATH. Usually
# 		80 unless VAR_HTTP_PATH was one of the following forms:
# 			http://hostname:OTHER_PORT
# 			http://hostname:OTHER_PORT/*
# 			http://ip:OTHER_PORT
# 			http://ip:OTHER_PORT/*
# 			http://[ip6]:OTHER_PORT
# 			http://[ip6]:OTHER_PORT/*
# 	VAR_HTTP_DIR
# 		If VAR_HTTP_PATH contained a directory element (e.g.,
# 		"http://localhost/pub") this variable contains only the
# 		directory element (e.g., "/pub").
#
f_media_set_http()
{
	f_media_close

	local url
	f_getvar $VAR_HTTP_PATH url

	# If we've been through here before ...
	if f_struct device_network && [ "${url#$msg_other}" ]; then
		f_dialog_yesno "$msg_reuse_old_http_site_settings" || url=
	fi

	if [ ! "$url" ]; then
		f_dialog_menu_media_http || return $FAILURE
		f_getvar $VAR_HTTP_PATH url
	fi
	[ "$url" ] || return $FAILURE

	case "$url" in
	other)
		setvar $VAR_HTTP_PATH "http://"
		f_variable_get_value $VAR_HTTP_PATH \
			"$msg_please_specify_url_of_freebsd_http_distribution"
		f_getvar $VAR_HTTP_PATH url
		if [ ! "${url#http://}" ]; then
			unset $VAR_HTTP_PATH
			return $FAILURE
		fi
		if [ ${#url} -gt ${URL_MAX:-261261} ]; then
			f_show_msg "$msg_length_of_specified_url_is_too_long" \
			           ${#url} ${URL_MAX:-261261}
			unset $VAR_HTTP_PATH
			return $FAILURE
		fi
		case "$url" in
		http://*) : valid URL ;;
		*)
			f_show_msg "$msg_sorry_invalid_url" "$url"
			unset $VAR_HTTP_PATH
			return $FAILURE
		esac
	esac
	case "$url" in
	http://*) : valid URL ;;
	*)
		f_show_msg "$msg_sorry_invalid_url" "$url"
		unset $VAR_HTTP_PATH
		return $FAILURE
	esac

	# Set the name of the HTTP device to the URL
	f_struct_new DEVICE device_http
	device_http set name "$url"

	if ! f_struct device_network ||
	   ! f_dialog_yesno "$msg_youve_already_done_the_network_configuration"
	then
		f_struct device_network &&
			f_device_shutdown network
		if ! f_device_select_tcp; then
			unset $VAR_HTTP_PATH
			return $FAILURE
		fi
		local dev
		f_getvar $VAR_NETWORK_DEVICE dev
		f_struct_copy "device_$dev" device_network
	fi
	if ! f_device_init network; then
		f_dprintf "f_media_set_http: %s" "$msg_net_device_init_failed"
		unset $VAR_HTTP_PATH
		return $FAILURE
	fi

	local hostname="${url#*://}" port=80 dir=/
	case "$hostname" in
	#
	# The order in-which the below individual cases appear is important!
	#
	"["*"]":*/*) # IPv6 address with port and directory
		f_dprintf "Looks like an IPv6 addr with port/dir: %s" \
		          "$hostname"
		hostname="${hostname#\[}"
		port="${hostname#*\]:}"
		port="${port%%[!0-9]*}"
		dir="/${hostname#*/}"
		hostname="${hostname%%\]:*}"
		;;
	"["*"]":*) # IPv6 address with port
		f_dprintf "Looks like an IPv6 addr with port: %s" "$hostname"
		hostname="${hostname#\[}"
		port="${hostname#*\]:}"
		port="${port%%[!0-9]*}"
		hostname="${hostname%%\]:*}"
		;;
	"["*"]"/*) # IPv6 address with directory
		f_dprintf "Looks like an IPv6 addr with dir: %s" "$hostname"
		hostname="${hostname#\[}"
		dir="/${hostname#*/}"
		hostname="${hostname%%\]*}"
		;;
	"["*"]") # IPv6 address
		f_dprintf "Looks like an IPv6 addr: %s" "$hostname"
		hostname="${hostname#\[}"
		hostname="${hostname%\]}"
		;;
	#
	# ^^^ IPv6 above / DNS Name or IPv4 below vvv
	#
	*:*/*) # DNS name or IPv4 address with port and directory
		f_dprintf "Looks like a %s with port/dir: %s" \
		          "DNS name or IPv4 addr" "$hostname"
		port="${hostname#*:}"
		port="${port%%[!0-9]*}"
		dir="/${hostname#*/}"
		hostname="${hostname%%:*}"
		;;
	*:*) # DNS name or IPv4 address with port
		f_dprintf "Looks like a DNS name or IPv4 addr with port: %s" \
		          "$hostname"
		port="${hostname#*:}"
		hostname="${hostname%%:*}"
		;;
	*/*) # DNS name or IPv4 address with directory
		f_dprintf "Looks like a DNS name or IPv4 addr with dir: %s" \
		          "$hostname"
		dir="/${hostname#*/}"
		hostname="${hostname%%/*}"
		;;
	*) # DNS name or IPv4 address
		f_dprintf "Looks like a DNS name or IPv4 addr: %s" "$hostname"
		: leave hostname as-is
	esac

	f_dprintf "hostname = \`%s'" "$hostname"
	f_dprintf "dir = \`%s'" "$dir"
	f_dprintf "port \# = \`%d'" "$port"

	local ns
	f_getvar $VAR_NAMESERVER ns
	[ "$ns" ] || f_resolv_conf_nameservers ns
	if [ "$ns" -a ! "$HTTP_SKIP_RESOLV" ] && ! {
		f_validate_ipaddr "$hostname" ||
		f_validate_ipaddr6 "$hostname"
	}; then
		f_show_info "$msg_looking_up_host" "$hostname"
		f_dprintf "%s: Looking up hostname, %s, using host(1)" \
		          "f_media_set_http" "$hostname"
		if ! f_quietly f_host_lookup "$hostname"; then
			f_show_msg "$msg_cannot_resolve_hostname" "$hostname"
			f_struct device_network &&
				f_device_shutdown network
			f_struct_free device_network
			unset $VAR_HTTP_PATH
			return $FAILURE
		fi
		f_dprintf "Found DNS entry for %s successfully." "$hostname"
	fi

	setvar $VAR_HTTP_HOST "$hostname"
	setvar $VAR_HTTP_PORT "$port"
	setvar $VAR_HTTP_DIR  "$dir"

	device_http set type     $DEVICE_TYPE_HTTP
	device_http set init     f_media_init_http
	device_http set get      f_media_get_http
	device_http set shutdown f_media_shutdown_http
	device_http set private  network
	f_struct_copy device_http device_media
	f_struct_free device_http

	return $SUCCESS
}

# f_http_check_access [$connect_only]
#
# Return success if able list a remote HTTP directory. If $connect_only is
# present and non-null, then returns success if a connection can be made.
# Variables from variable.subr that can be used to script user input:
#
# 	VAR_HTTP_HOST
# 		The HTTP server host name, IPv4 address or IPv6 address.
# 		Valid examples include:
# 			myhost
# 			192.168.2.3
# 			::1
# 	VAR_HTTP_PORT
# 		The TCP port to connect to when communicating with the server.
# 	VAR_HTTP_PATH
# 		The HTTP path sent to the server. Unused if $connect_only is
# 		present and non-NULL.
#
f_http_check_access()
{
	local connect_only="$1" hosts=

	local http_host http_port
	f_getvar $VAR_HTTP_HOST http_host
	f_getvar $VAR_HTTP_PORT http_port

	if ! {
		f_validate_ipaddr "$http_host" ||
		f_validate_ipaddr6 "$http_host" ||
		{
		  f_dprintf "%s: Looking up hostname, %s, using host(1)" \
		            "f_http_check_access" "$http_host"
		  f_host_lookup "$http_host" hosts
		}
	}; then
		# All the above validations failed
		[ "$hosts" ] && f_dialog_msgbox "$hosts"
		unset $VAR_HTTP_HOST
		return $FAILURE
	elif [ ! "$hosts" ]; then
		# One of the first two validations passed
		hosts="$http_host"
	fi

	local host connected=
	for host in $hosts; do
		f_quietly nc -nz "$host" "$http_port" || continue
		connected=1; break
	done
	if [ ! "$connected" ]; then
		f_show_msg "$msg_couldnt_connect_to_server http://%s:%s/" \
		           "$http_host" "$http_port"
		unset $VAR_HTTP_HOST
		return $FAILURE
	fi
	[ "$connect_only" ] && return $SUCCESS

	local http_path
	f_getvar $VAR_HTTP_PATH http_path
	f_show_info "$msg_checking_access_to" "$http_path"

	local rx
	if ! rx=$(
		printf "GET /%s/ HTTP/1.0\r\n\r\n" "${http_path%/}" |
			nc -n "$host" "$http_port"
	); then
		f_show_msg "$msg_couldnt_connect_to_server http://%s:%s/" \
		           "$http_host" "$http_port"
		unset $VAR_HTTP_HOST
		return $FAILURE
	fi

	local hdr
	hdr=$( echo "$rx" | awk '/^\r$/{exit}{print}' )

	local http_found=$FAILURE
	if echo "$hdr" | awk '
		BEGIN { found = 0 }
		/^HTTP.... 200 / {
			found = 1
			exit
		}
		END { exit ! found }
	'; then
		http_found=$SUCCESS
	fi

	return $http_found
}

# f_media_init_http $device
#
# Initializes the HTTP media device. Returns success if able to confirm the
# existence of at least one known HTTP server release path directly via HTTP
# using f_http_check_access(), above.
#
# Variables from variable.subr that can be used to script user input:
#
# 	VAR_HTTP_HOST
#		The HTTP server to connect to. Must be set. Also see
# 		f_http_check_access() for additional variables.
# 	VAR_RELNAME
# 		Usually set to `uname -r' but can be overridden.
# 	VAR_HTTP_PATH
# 		The HTTP path sent to the server. Usually set by calling
# 		f_media_set_http().
#
# Meanwhile, after successful execution, the following variables (also from
# variable.subr) are set:
#
# 	VAR_HTTP_PATH
# 		The [possibly] adjusted VAR_HTTP_PATH that was found to contain
# 		a valid FreeBSD repository.
#
f_media_init_http()
{
	local dev="$1"
	f_dprintf "Init routine called for HTTP device. dev=[%s]" "$dev"

	#
	# First verify access
	#
	local connect_only=1
	f_http_check_access $connect_only

	local http_host
	f_getvar $VAR_HTTP_HOST http_host
	while [ ! "$http_host" ]; do
		f_media_set_http || return $FAILURE
		f_http_check_access $connect_only
		f_getvar $VAR_HTTP_HOST http_host
	done

	local http_path http_found=$FAILURE
	while :; do
		#
		# Now that we've verified that the path we're given is ok,
		# let's try to be a bit intelligent in locating the release we
		# are looking for.  First off, if the release is specified as
		# "__RELEASE" or "any", then just assume that the current
		# directory is the one we want and give up.
		#
		local rel
		f_getvar $VAR_RELNAME rel
		f_dprintf "f_media_init_http: rel=[%s]" "$rel"

		case "$rel" in
		__RELEASE|any)
			setvar $VAR_HTTP_PATH "$VAR_HTTP_DIR"
			f_http_check_access
			http_found=$?
			;;
		*)
			#
			# Ok, since we have a release variable, let's walk
			# through the list of directories looking for a release
			# directory. First successful path wins.
			#
			local fdir hp
			f_getvar $VAR_HTTP_PATH%/ hp
			for fdir in $HTTP_DIRS; do
				setvar $VAR_HTTP_PATH "$hp/$fdir/$rel"
				if f_http_check_access; then
					http_found=$SUCCESS
					break
				fi
			done
		esac

		[ $http_found -eq $SUCCESS ] && break

		f_getvar $VAR_HTTP_PATH http_path
		f_show_msg "$msg_please_check_the_url_and_try_again" \
		           "$http_path"

		unset $VAR_HTTP_PATH
		f_media_set_http || break
	done

	return $http_found
}

# f_media_get_http $device $file [$probe_only]
#
# Returns data from $file on an HTTP server using nc(1). Please note that
# $device is unused but must be present (even if null). Information is instead
# gathered from the environment. If $probe_only is both present and non-NULL,
# this function exits after receiving the HTTP header response from the server
# (if the HTTP response code is 200, success is returned; otherwise failure).
#
# The variables used to configure the connection are as follows (all of which
# are configured by f_media_set_http above):
#
# 	VAR_HTTP_HOST
# 		HTTP server which to connect. Can be an IPv4 address, IPv6
# 		address, or DNS hostname of your choice.
# 	VAR_HTTP_PORT
# 		TCP port to connect on; see f_media_set_http above.
# 	VAR_HTTP_PATH
# 		Directory prefix to use when requesting $file. Default is `/'
# 		unless f_media_init_http was able to use f_http_check_access
# 		to validate one of the defaults in $HTTP_DIRS (see GLOBALS at
# 		the top of this file); assuming VAR_RELNAME was not set to
# 		either `__RELEASE' or `any' (indicating that the global set of
# 		$HTTP_DIRS should be ignored).
#
# See variable.subr for additional information.
#
# Example usage:
# 	f_media_set_http
# 	f_media_get_http media $file
#
f_media_get_http()
{
	local dev="$1" file="$2" probe_only="$3" hosts=

	f_dprintf "f_media_get_http: dev=[%s] file=[%s] probe_only=%s" \
	          "$dev" "$file" "$probe_only"

	local http_host http_port
	f_getvar $VAR_HTTP_HOST http_host
	f_getvar $VAR_HTTP_PORT http_port

	if ! {
		f_validate_ipaddr "$http_host" ||
		f_validate_ipaddr6 "$http_host" ||
		{
		  f_dprintf "%s: Looking up hostname, %s, using host(1)" \
		            "f_media_get_http" "$http_host"
		  f_host_lookup "$http_host" hosts
		}
	}; then
		# All the above validations failed
		[ "$hosts" ] && f_dialog_msgbox "$hosts"
		return $FAILURE
	elif [ ! "$hosts" ]; then
		# One of the first two validations passed
		hosts="$http_host"
	fi

	local host connected=
	for host in $hosts; do
		f_quietly nc -nz "$host" "$http_port" || continue
		connected=1; break
	done
	if [ ! "$connected" ]; then
		f_show_msg "$msg_couldnt_connect_to_server http://%s:%s/" \
		           "$http_host" "$http_port"
		return $FAILURE
	fi

	local http_path
	f_getvar $VAR_HTTP_PATH%/ http_path
	local url="/$http_path/$file" rx

	f_dprintf "sending http request for: %s" "$url"
	printf "GET %s HTTP/1.0\r\n\r\n" "$url" | nc -n "$host" "$http_port" |
	(
		#
		# scan the headers of the response
		# this is extremely quick'n dirty
		#

		rv=0
		while read LINE; do
			case "$LINE" in
			HTTP*)
				f_dprintf "received response: %s" "$LINE"
				set -- $LINE; rv=$2
				f_isinteger "$rv" || rv=0
				;;
			*)
				[ "${LINE%
}" ] || break # End of headers
			esac
		done

		[ $rv -ge 500 ] && exit 5
		[ $rv -eq 404 ] && exit 44
		[ $rv -ge 400 ] && exit 4
		[ $rv -ge 300 ] && exit 3
		[ $rv -eq 200 ] || exit $FAILURE

		if [ ! "$probe_only" ]; then
			cat # output the rest ``as-is''
		fi
		exit 200
	)
	local retval=$?
	[ $retval -eq 200 ] && return $SUCCESS
	[ "$probe_only" ] && return $FAILURE

	case "$retval" in
	  5) f_show_msg "$msg_server_error_when_requesting_url" "$url" ;;
	 44) f_show_msg "$msg_url_was_not_found" "$url" ;;
	  4) f_show_msg "$msg_client_error" ;;
	  *) f_show_msg "$msg_error_when_requesting_url" "$url" ;;
	esac
	return $FAILURE
}

############################################################ MAIN

f_dprintf "%s: Successfully loaded." media/http.subr

fi # ! $_MEDIA_HTTP_SUBR